Massey Ferguson 06.03.04 – TRANS1: Issue With Rear PTO On/Off Solenoid Power Supply Dyna VT / Dyna 6 (TRANS1)

The transmission controller has detected an electrical fault—such as an open circuit, a short to ground (0V), or a short to power (+12V)—in the power supply circuit that activates the rear Power Take-Off (PTO) clutch engagement solenoid.

• 7720S
• 7724S
• 7716
• 7720
• Tier 4 (2015-2021)
• 7718
• 7722
• 7722S
• 7715S
• 7718S
• 7715
• 7726
• 7719
• 7714
• 7724
• 7716S
• 7726S
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 6712 S through 6718 S
• 8650-8690
• 8727 S-8740 S

1. 1

   Locate the Solenoid: The rear PTO clutch solenoid valve is typically located on the rear axle housing, directly behind the hydraulic spool valves.

2. 2

   Inspect the Wiring Harness: Check the wiring harness running from the TRANS1 controller to the rear PTO solenoid for chafing, broken wires, or melted insulation.

3. 3

   Check the Connector: Disconnect the electrical plug at the solenoid and inspect for corrosion, moisture, or bent pins.

4. 4

   Test the Solenoid Coil: Use a multimeter to measure the resistance across the solenoid coil pins. An infinite reading indicates an open internal circuit (a dead coil), while a reading near zero indicates an internal short.

5. 5

   Test Power Supply: With the tractor running and the PTO switch activated, check for voltage at the harness connector to ensure the TRANS1 module is actually sending the +12V signal.

1. 1

   Turn off the tractor, relieve all hydraulic system pressure, and disconnect the battery.

2. 2

   Clean the area around the rear axle housing (behind the spool valves) to prevent dirt from entering the hydraulic system.

3. 3

   Disconnect the electrical connector from the PTO solenoid.

4. 4

   Remove the retaining nut/bolt at the end of the valve stem and slide the electromagnetic coil off.

   Note: If the hydraulic cartridge itself is leaking or sticking, unthread the entire cartridge valve from the housing.

5. 5

   Lubricate the O-rings on the new solenoid valve with clean hydraulic fluid and install it into the housing.

6. 6

   Slide the new coil over the stem and secure it with the retaining nut.

7. 7

   Reconnect the electrical connector.

8. 8

   Check the transmission/hydraulic fluid level and top up if necessary.

9. 9

   Reconnect the battery, start the tractor, and test the rear PTO engagement to ensure smooth operation and verify the code has cleared.